The hermit crab is a type of crab that does no have a very hard shell. Not actually a true crab, it uses other animals’ old shells for protection; they especially like whelk shells. As a hermit crab grows in size, it must continue to find larger shells. There are about 500 species of hermit crabs found throughout the world. Most hermit crabs live on the ocean floor, but many can live on land. The sketch is direct to watercolor without ink. Holbein and Daniel Smith watercolors in a Stillman and Birn sketchbook.